Great informative thread BTW.
Some times a good car wash is necessary, to properly detail Northern cars & remove ugly sights of 4Sale rust.
Unsightly rust from steel licence plate bolts & iron bleed off / paint damage:
Novus was designed to remove windshield scratches, off Boeing 747's.
- I used bottle #3 containing abrasive grit, to remove rust stains
Loctite Extend (AutoZone can, in above photo) coating on rusted bolt heads, neutralize rust with a phosphate coating.
- after dry time, spray good primer on nut heads / Mar-Hyde single stage self etching primer, is very decent quality
End result - SOLD...